P0410moderate severityPowertrain
Secondary Air Injection System
on 2019 Audi A6 3.0L V6 TFSI · AWD
What this code means
Malfunction in the secondary air injection (AIR) system. This system pumps fresh air into the exhaust to reduce cold-start emissions.
Symptoms
- Check Engine Light
- Failed emissions test
- Unusual noise from AIR pump on startup
Common causes
- Faulty AIR pump
- Check valve failure
- AIR pump relay failure
- Hose deterioration
- Blocked passages
Diagnostic steps
- Test AIR pump operation
- Check AIR pump relay
- Inspect check valves
- Check for blocked passages
- Verify air is flowing into exhaust manifold
Repair notes
Replace AIR pump or check valve. This system only runs briefly during cold start on most vehicles.
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